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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4bd7c348a44b73cfc9d85edac7cfd148554481c43b4a3b44d4cb9bf35c9741' 
  AND token = '7RGoLsBYsn9si1GGc6zO1xJuT9T6J1oa3pM1ks6eHUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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