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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cbf7373be535a11c959797504cd8629b5c300dabb725773eee4f524a4987ca2' 
  AND token = 'vkkX4IxxdzEKnMRRoDguEXFsvQU5iQod+wj57Z+tqPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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