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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bfc66f774347b864f6793b095eecd43920d758be4c27642f1dfcf132e9c56b' 
  AND token = 'LemqSayS6hsTNwxCYZP4IY/VGg7ucID40Rv/fof7OlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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