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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6a69260dd472a89ef8e4b32f95abeba8da9daf68c43f8b5bc49800d1ebce72' 
  AND token = 'WXXg810Ex7diBMrNt/t21O94rgxLYxPfq8PwRv+AXWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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