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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87edc774ebccf7ce45cee02bfddc35ef30b59fe7fdd0f2e09031cebca3963b8d' 
  AND token = 'eTE9AEOdlGZIyFKeoMJfdN+GAZ7QYZLyR5gE1ouofWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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