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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac12aeb9049d307fdf0792b4ed3c03a55ddba12cc3eec717f72656764c662d4' 
  AND token = 'gjf4uTty3o2YOWpjwpIACtmb8ItT1gyIBz9O8XGBzpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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