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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274d851b6fc2b848973a7d608b95419ff01e14698b25b7f78e602272b17d8d1e' 
  AND token = '1ezguO0uHRttLuW5lkdLVmzzcZXr/T7yN5ztkVdYrcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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