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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8c7daf7544c5808a38c5c368adda094a514d7040e7000069fbc9dd4490e223' 
  AND token = 'IM0tMqcFoqG+ye8/C8Jlh998ywGNbEwjPBM5ymZ6oLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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