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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae4f55d1595e8a75f2e070e5f7ee00b44744e10b59b780c3868c2a2cc6bc002' 
  AND token = 'HMYRg18JNj3+ZJjZjgUVWTwdddhdvoMbZxwJfDZRk9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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