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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ec6685785c2f4ababb33baebde371192bfa69711ee90c01b8ec2456be6ae88' 
  AND token = '7C2T32IxcaSt0SNJruCUBmsWNw6g1nb+DpvYl1NEW/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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