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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '480c6974ad66d7ff8accd84183145e8cc926c39e07d018428b97d063a570028b' 
  AND token = '6ezY6KgIB5z1NHUFP7sa7fZC4/0EXksSsx09FmMblk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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