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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876d73a0c1b8bcc946550712f05b49e3f51485e16f0eabc9059680070efd3903' 
  AND token = 'kQ0vslvxwrgk2K8aIL+6wOLPCSrafG4buHUTZuI/Eo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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