SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf06e7f391dd5399d3a75a9b06eb130678a558a72e971d8aab409007549bee9' 
  AND token = 'KQM+R1vBuWqXlgCa6Ic9YV36Jp/W/jk24xTN6rz8kSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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