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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8115655fc7849d9ff2a230b3e5c2db8fe7be0b949f47c9fdef32ebce382b3e5b' 
  AND token = 'H0XeXHxH5LsXKAYlA3DOFB9DhhIG2e0rae67cR8qZAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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