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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e9c97cfb323b6da2b5a627833ffc971b7499d5296607776e1897b5cc7153bf' 
  AND token = 'rfeo9axjn4hXOQIIJcofW6uJbUzv0yQshHGgQZ60vNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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