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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e6326bcbea0ad8e78b54953dcba3f721220a15d03e3b6dfacef050d98fc7e9' 
  AND token = '3sC/VyJu4+ZtozllvaQXn0XYIOMcLr7Pk+ncC2/I/ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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