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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae00530d3c0589013ad2dd6aba7ba626268798bb2a18e8c82486a112165f2f0' 
  AND token = 'vjxkjnhkc7EwNv0jr5mDP5kSd41cvYze2rLzMv51eOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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