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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a6fd7e1b7d33c9acec5a6d37c0ee5d9810bade5a41b6d583eb5e57b47d9dda' 
  AND token = 'Xk5ryzI3hRXoWFjMh+8nWzSIVH+5Gu9sRLJN+mAzAHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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