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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a5f9ee4e9e12d59841cd90e6f00056561002f2b9d16081c14e6ca5842f13e9' 
  AND token = 'tlNedBm+x1V9kw+L+/FNC/AHvyonY7WFAknf+NvG3N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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