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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2fb6889ae19ae527970843c28285339aa1b79b2b58fc7aacd86c76de39fc0c' 
  AND token = 'FofJBTor65M9nJzrYCXYNYPa6BM5Xf6d/z5rFQMNkqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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