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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bca460a883bcda953edacda4826d43483893dad705d680f3c4f024365abc5b' 
  AND token = '4Ax02cwNz6b3cxiSKfnNZLfGgr8n7i3LL5aaQh1TvHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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