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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f0867f9a5f6c258cfc911041688c66d29e92f1cc77b62483a8d0f9620e87e4' 
  AND token = '3DhVRXT9otj/cS0DmD8yCe1noh+xp4jvebnGCAadKjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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