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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4130873551b28610f41ddde0aa7aef77e64b71c73f598e97d7c319ddd3453397' 
  AND token = 'nz7YfosY7ggEmRRI2QfIhqK5X5JX15NIOJcyswjNtiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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