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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5ec8850c5d13e0f6177aa2015824723bda512f9d408dc7790273f477b5f1ee' 
  AND token = '9pztXUSF7UJeliTm/DJbajfl5+CQIUb69aETWg1rJvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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