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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e25f3632683960a29c0310c6e4dc034825f55520e3450b819ec5e85bfee6cb' 
  AND token = 'VgqGjbprOHJE2VMQVWq9Q8mC8z6iF2bMma6hOR6DV28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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