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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a024900c1a1ff4df6090480d3cb60d4a4c7040976a25a9157792ef1c3369df5d' 
  AND token = 'WWVOKtaY6VgIe9cUAh5q21ftLdBs2uKpLRcdjowUAxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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