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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7019ff5e16cd0efe2c2fa31eb0fb3220252a3aacce034b4f6bef0b2e16d60f' 
  AND token = '8S0Fcxzrb5/xPXRt6BGvhHinqUETpTP1AgLqZBov0M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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