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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370550f808147084560d077c0153aa45a963f2288ca32e3bf8ac87f8ad822756' 
  AND token = 'UCHPWUR5F5XXHmc8qeuxJzywndP/55JBm9TX0e7jAfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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