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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfdbd251abd5f412062613e6b6f6872abb0d6384f2bd1b0e4cb35d1b4c7a2b17' 
  AND token = '3lDKSKXelHKgWE/yOVD7XlMWO/pCOGoOUCA18a/CW9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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