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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2bef761a402c5b7a8d2c51b1a0130dbab8acf0ab91e9f830b8c1a77eac3655c' 
  AND token = 'XzUjhHNP9C1e0X8L8ZZOG+SSQ3PQCUBdk/ugsig+J9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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