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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b22c40848716db2e7bc58acd0a7e97be6ef98bb8104ecc9a8c3a984bee68e91' 
  AND token = '8n+84iEGoU93QDCQcL5uBjy5rwfWaMq/QIFtubBNH/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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