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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35bdc17884cada1d3c91d27176941ad51cce90a74815c584a523e97b52bf814b' 
  AND token = 'PvadLr1DaEiaNe/a4vh68w8ldqP2ycKWcdYVIPFjsOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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