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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f84b302679deec19f9ea23a03e6296dc71dc7e32bf7783d502f4b93910da16' 
  AND token = 'Q2E6Rfavo+HIglAC0sc5lmhydnNXL3y9LWwA9wSei9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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