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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd555bc11187097d96cd8f35c1db083432b11aac8740fc1e9d0dde13b1b12a21' 
  AND token = 'la7YDJu2myI6RtxZuRyU7thvwSAJF7XOCXgJFDvexdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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