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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1127dde94898ce656fd7473c21d37b00bfd30f2d99703410d449aa9f848bd5f' 
  AND token = 'p5toDGXdteZMQm6BD7zJSL48ULxaE0RfZAIxBv5UtnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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