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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc38c9a9fe6bf45ec3dc22c8de31a59a907c1f5c0bb990351158a41687f3b8c4' 
  AND token = 'mHzVGZTzT+KE8Wy/bWmoNvhebjcU7uO+VL/OGL8zD9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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