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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff85cbc3077a9b41d346256ddba1e1b1e451d162107dab0a6f3e71da927c1836' 
  AND token = 'XWCuxjJ18aCcvQ4NIVhf93yWNxDvO859UnDAW8Xx1TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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