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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8192fb7231006589894420887dcc6cdd8e3591957ffc2833cb10734728df31e' 
  AND token = '9nQkgEeTz23aJ+JudoYDwK139C7KoJeGOSQWVMRooJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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