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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a6c8628a8a303701b65602836ee8ea3ff6956ff81c4727b6b8c75d93b7359f' 
  AND token = 'h9dOwOB3jYtEZH0xq7ENPaaMK26gDP0xfpQMBhVVoMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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