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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23404e3738f9f32a0bacc86eb4bace89c768920b6d7e0ffc3015077af3bda9b' 
  AND token = 'Lq2o3Z7OMaWfe/Wwjy5R3u36mC85wYmWqtLmSPG7B0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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