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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71eb99a6587fb2dc98b7adc4c28b4bb0f1bb04efea2a7d09889b8717b90ec1a7' 
  AND token = 'ZSqBn7QlI9s6lH9LoaHF2EmqEhGxcUbTV8+SR+L7JcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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