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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3198f536e6a34cac1d95ac4fd008beb4c6133c2aace93e606d54878b152a9c41' 
  AND token = 'Rzq3b8S+fPDtwhXORt4fjZw+MFEQRdQHc91rCeNfmss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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