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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab40044a10ec01440489044c018c311cc73b0ee931b315a17c064d5e8c6f07e4' 
  AND token = 'r8XDm4sddkvk9eaTHbnxW6dczhLlBGNfeyC8Qy7euvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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