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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e49472920e1b3bfbc9f5295d1641f44e74a5f718470bf81c7c483a8dbc407b9' 
  AND token = '1ta4k60mVYSLpKamqubtuv4ua08B8mTcSKAq0lb5FRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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