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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5829461c6c75a1cb24a25de5b581192f7065e854466413c35167b6f179432a5e' 
  AND token = '173wprXSEI6isWQrVcf7+EIwW6CNs7XQXYPfXSYHFaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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