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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb766511fead36b7ed031f7f326abe9a48bccae63f493f569e2f9125a968796b' 
  AND token = '7GswATyEAYYuKhstp8RxY8VzUS6gfpAROVRJkLX23uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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