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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4467c55c42a9c72674efb8ea70d565c128541d5920a5c9daef91605a45e663a' 
  AND token = 'cdT7b7AQe2BkVwhac8m6MtXNmvEGNw8v1ziqsbxqPPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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