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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f0d56de6a35d5e519358d125daee0c8455faa96c3d8ec3beff3752494f3875' 
  AND token = 'esrrMSJG3omdS5XzmaeB48DkLhzWVOav1Z55ZWkePkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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