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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71553ae5ac7cd7ed27d369a4276d8c11e3e2c0105e3e18dfc572e1cf0c8d01c' 
  AND token = 'vOnHgkQRKnXqlYs8cWcRK4ZtpIm+GexqdpRP4/tpq8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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