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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25e23ec9dfa16c8126f65f7857810d834b492af8c684991aa018f3fff97825a' 
  AND token = 'fK9qh+13Y+rBibzNS7YecQFreZuzi2Ln5sNlHeW/Iyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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