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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46aa52f64bdae6ea9cda237ae2dc3733af55758fccc8ce09af279ff898b7992f' 
  AND token = '97StiqRjSHkodI5tibRtyYot7t/p3NOc5ICDiBIAG/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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