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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2484080565a9368def82654c6aeb62002c53ced249756e9cd724337d842bd6b' 
  AND token = 'JTnRmvQiSJtb16yQo0EBs4C+jr+pwhSvXryKeL4V2gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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