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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f341de8c84b66ed17c3f17e8a76351eb4518fbf030771fcc648c06cca937c19' 
  AND token = 'h5H1gLkL8mit4eCuDgJxVaCCzuqtI6y19Itt5oCjMV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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