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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df893ae4c7942fa8dd04db383f432a7cb72a45a4a878a34ce9b9c9ade107028c' 
  AND token = 'vj5me6pidS62sF6dtGL2JD2QTWz7rpjcY1Y9qdlAEUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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