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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd092d508c9c322293357d8337dc685828b139516db706b9fa4890a560de3ef06' 
  AND token = 'n8LJaP5hTzKu6B5iiZYsrjnIUMoVzdd30S1JAvP75kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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