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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cb0974a9decb07f7ca72b5309488b97c1db55b0a30f9a0c6c33aa3cbc5658f' 
  AND token = '/YjQGBTdrmbJJrugu9PpBmPGGnrDlRpCbYY4Ket2wUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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