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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7400dea72b2d41bdcde6763388c70d82393abc07199a751c2056b898df9d4c9' 
  AND token = 'EIHc07Z87hMzulQC9K9q0g5JRDUDAqxQnutURHDGTRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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