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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58974164a49c326a7053dfe2e57f1b8946b78a28f3e80fadde1b63b261fe1261' 
  AND token = 'X1dDE9umbvgGRZnv5XACUkDXG/IAsvyay98zJqy7G7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}