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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd289ab8c8daf7661c3e415cf8401dfe58bab36ad90ca1d6855f1ff2981994c' 
  AND token = 'F/ArxUXR4s33NKTHVMvW8z1YSWBVmClKXeAxmLopLzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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